1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. LT3653


Features and Benefits

  • Wide Input Range:
    • Operation from 7.5V to 30V
    • Overvoltage Lockout Protects Circuit Through 60V Transients
  • Operates with LTC Bat-Track Li-Ion Battery Chargers to Maximize Efficiency
  • No Reverse Discharge Path from VOUT to VIN
  • Programmable Output Current Limit
  • Integrated BOOST Diode
  • Thermal Protection
  • Small Application Size
  • Thermally Enhanced 2mm × 3mm DFN Package

Product Details

The LT3653 is a monolithic current mode PWM step-down regulator with programmable output current limit. Typically, it is used with battery charger power path controllers to pre-regulate the output and optimize the battery charger efficiency. Output current limit provides accurate control over system power dissipation.

The wide operating input voltage range of 7.5V to 30V suits the LT3653 to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, Firewire and automotive power. Input overvoltage protection allows the LT3653 to handle 60V input transients.

The LT3653 control pin, VC, is available for external battery tracking control, Bat-Track. The LT3653 will block output discharge during an open or shorted input.

The HVOK pin indicates that the internal bias supplies are present and no faults have occurred (i.e., overtemperature and input overvoltage and undervoltage). The LT3653 includes a 1.5MHz frequency oscillator, internal compensation, and an internal boost diode to minimize the number of external components. The LT3653 is available in an 8-lead (2mm × 3mm) package with exposed pads for low thermal resistance.


  • Battery Powered Equipment
  • Portable USB Devices – Cameras, MP3 Players, PDAs
  • Automotive Battery Regulation
  • Multiple-Source Battery Chargers

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Product Recommendations

LT3653 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LT3653EDCB#TRMPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 3mm w/ EP)
LT3653EDCB#TRPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 3mm w/ EP)
LT3653IDCB#TRMPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 3mm w/ EP)
LT3653IDCB#TRPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 3mm w/ EP)
Wafer Fabrication Data R530 Reliability Data

Sample & Buy

Ordering FAQs

See our Ordering FAQs for answers to questions about online orders, payment options and more.


Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help